As per the multitude of guides I've read on tuning, I've been slowly edging the values in the "TPS Threshold for PE" tables (high and low coolant temp) up to enable tuning the VE at higher engine loads.

However, I've just come across a couple threads on other forums of very excited people swearing this method will inevitably cause your engine to self-destruct, I assume due to detonation.
The guides I read made clear the risk of detonation, but I have forged pistons and don't have an extreme build (est. <320hp from a 383), and I had been closely monitoring knock counts (<10 in a 25min datalogging loop), but if you guys have had bad experiences doing this way, I definitely would rather play it safe.

Is there merit to this: should I just extrapolate to calculate my high-load VEs, or do I need to get a wideband O2 sensor to tune these areas?

Thanks in advance.